Exclude target folder from spotless to fix gradle compilation cache and add git blame ignore list

[mbellade]

Follow up to #8952

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[gavinking]

I guessing Gradle will now also let us remove these lines:

tasks.spotlessJava.dependsOn ':hibernate-core:generateGraphParser'
tasks.spotlessJava.dependsOn ':hibernate-core:generateHqlParser'
tasks.spotlessJava.dependsOn ':hibernate-core:generateSqlScriptParser'
tasks.spotlessJava.dependsOn ':hibernate-core:generateOrderingParser'

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[mbellade]

If there's no objection I'll go ahead and merge this

[gavinking]

Yes of course.